Average Weather in September in Santa Rosa de Copán Honduras
Daily high temperatures are around 79°F, rarely falling below 74°F or exceeding 83°F.
Daily low temperatures are around 64°F, rarely falling below 62°F or exceeding 66°F.
For reference, on April 19, the hottest day of the year, temperatures in Santa Rosa de Copán typically range from 61°F to 83°F, while on January 30, the coldest day of the year, they range from 58°F to 74°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in September
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The month of September in Santa Rosa de Copán experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 90% throughout the month. The highest chance of overcast or mostly cloudy conditions is 91% on September 19.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 11% of the time.
For reference, on June 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on January 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
Cloud Cover Categories in September
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santa Rosa de Copán, the chance of a wet day over the course of September is essentially constant, remaining around 44% throughout.
For reference, the year's highest daily chance of a wet day is 47% on September 15, and its lowest chance is 5% on March 9.
Probability of Precipitation in September
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during September in Santa Rosa de Copán is gradually decreasing, starting the month at 5.1 inches, when it rarely exceeds 9.3 inches or falls below 1.5 inches, and ending the month at 4.9 inches, when it rarely exceeds 9.3 inches or falls below 1.1 inches.
The highest average 31-day accumulation is 5.3 inches on September 17.
Average Monthly Rainfall in September
Over the course of September in Santa Rosa de Copán, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 24 minutes, implying an average daily decrease of 49 seconds, and weekly decrease of 5 minutes, 41 seconds.
The shortest day of the month is September 30, with 12 hours, 0 minutes of daylight and the longest day is September 1, with 12 hours, 24 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Santa Rosa de Copán is 5:42 AM on September 1 and the latest sunrise is 1 minute, 46 seconds later at 5:44 AM on September 30.
The latest sunset is 6:06 PM on September 1 and the earliest sunset is 22 minutes earlier at 5:44 PM on September 30.
Daylight saving time is not observed in Santa Rosa de Copán during 2021.
For reference, on June 21, the longest day of the year, the Sun rises at 5:26 AM and sets 13 hours, 0 minutes later, at 6:27 PM, while on December 21, the shortest day of the year, it rises at 6:15 AM and sets 11 hours, 15 minutes later, at 5:31 PM.
Sunrise & Sunset with Twilight in September
The figure below presents a compact representation of key lunar data for September 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in September
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Santa Rosa de Copán is gradually decreasing during September, falling from 52% to 50% over the course of the month.
The highest chance of a muggy day during September is 53% on September 17.
For reference, on June 11, the muggiest day of the year, there are muggy conditions 57% of the time, while on February 1, the least muggy day of the year, there are muggy conditions 1% of the time.
Humidity Comfort Levels in September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Santa Rosa de Copán is essentially constant during September, remaining within 0.1 miles per hour of 3.3 miles per hour throughout.
For reference, on January 13, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on September 15, the calmest day of the year, the daily average wind speed is 3.2 miles per hour.
The lowest daily average wind speed during September is 3.2 miles per hour on September 15.
Average Wind Speed in September
The hourly average wind direction in Santa Rosa de Copán throughout September is predominantly from the north, with a peak proportion of 48% on September 30.
Wind Direction in September
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
Temperatures in Santa Rosa de Copán are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in September
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Santa Rosa de Copán are rapidly increasing during September, increasing by 594°F, from 4,673°F to 5,267°F, over the course of the month.
Growing Degree Days in September
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Santa Rosa de Copán is essentially constant during September, remaining within 0.2 kWh of 4.9 kWh throughout.
The lowest average daily incident shortwave solar energy during September is 4.7 kWh on September 30.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Santa Rosa de Copán are 14.767 deg latitude, -88.779 deg longitude, and 3,760 ft elevation.
The topography within 2 miles of Santa Rosa de Copán contains very significant variations in elevation, with a maximum elevation change of 1,558 feet and an average elevation above sea level of 3,655 feet. Within 10 miles contains very significant variations in elevation (4,744 feet). Within 50 miles also contains extreme variations in elevation (9,327 feet).
The area within 2 miles of Santa Rosa de Copán is covered by cropland (56%) and trees (42%), within 10 miles by trees (45%) and cropland (32%), and within 50 miles by trees (55%) and cropland (27%).
This report illustrates the typical weather in Santa Rosa de Copán, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Santa Rosa de Copán.
For each station, the records are corrected for the elevation difference between that station and Santa Rosa de Copán according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Santa Rosa de Copán is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Santa Rosa de Copán and a given station.
The stations contributing to this reconstruction are: Santa Rosa De Copan (98%, 1.9 kilometers, north); Ilopango International Airport (1.1%, 124 kilometers, south); and Soto Cano Air Base (1.1%, 132 kilometers, east).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.